121493909 has 2 divisors, whose sum is σ = 121493910. Its totient is φ = 121493908.

The previous prime is 121493891. The next prime is 121493941. The reversal of 121493909 is 909394121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107640625 + 13853284 = 10375^2 + 3722^2 .

It is a cyclic number.

It is not a de Polignac number, because 121493909 - 2⁸ = 121493653 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121493609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60746954 + 60746955.

It is an arithmetic number, because the mean of its divisors is an integer number (60746955).

Almost surely, 2^121493909 is an apocalyptic number.

It is an amenable number.

121493909 is a deficient number, since it is larger than the sum of its proper divisors (1).

121493909 is an equidigital number, since it uses as much as digits as its factorization.

121493909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 121493909 is about 11022.4275456906. The cubic root of 121493909 is about 495.2808106367.

The spelling of 121493909 in words is "one hundred twenty-one million, four hundred ninety-three thousand, nine hundred nine".